diff --git a/pkgs/by-name/fi/fittrackee/package.nix b/pkgs/by-name/fi/fittrackee/package.nix
index d98509391e6c..f285a78a6a35 100644
--- a/pkgs/by-name/fi/fittrackee/package.nix
+++ b/pkgs/by-name/fi/fittrackee/package.nix
@@ -24,6 +24,7 @@ python3Packages.buildPythonApplication rec {
 
   pythonRelaxDeps = [
     "authlib"
+    "fitdecode"
     "flask"
     "flask-limiter"
     "flask-migrate"